Frequency trees

Maths

What is the probability of randomly selecting a student who did their homework?

Given that I select a girl, what is the probability that she didn't do her homework?

What is the probability that I spin 2 whites or 2 blacks?

What is the probability that I get exactly 1 black?

What is the probability that I get 1 white and 1 red?

What is the probability that I get 2 whites or 2 reds?